210720423 has 16 divisors (see below), whose sum is σ = 307086336. Its totient is φ = 127950720.

The previous prime is 210720407. The next prime is 210720437. The reversal of 210720423 is 324027012.

It is not a de Polignac number, because 210720423 - 2⁴ = 210720407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210720423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210720463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65061 + ... + 68222.

It is an arithmetic number, because the mean of its divisors is an integer number (19192896).

Almost surely, 2^210720423 is an apocalyptic number.

210720423 is a deficient number, since it is larger than the sum of its proper divisors (96365913).

210720423 is a wasteful number, since it uses less digits than its factorization.

210720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133334.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 210720423 is about 14516.2124192229. The cubic root of 210720423 is about 595.0711239508.

Adding to 210720423 its reverse (324027012), we get a palindrome (534747435).

The spelling of 210720423 in words is "two hundred ten million, seven hundred twenty thousand, four hundred twenty-three".